Research output: Contribution to journal › Article › peer-review
Exciton Channel of Photoactivation for Redox Reactions on the Surface of 2D ZnO Nanostructures. / Titov, Victor V. ; Lisachenko, Andrey A. ; Labzovskaya, Mariana E. ; Akopyan, Irina Kh. ; Novikov, Boris V.
In: Journal of Physical Chemistry, Vol. 123, No. 45, 11.2019, p. 27399-27405.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Exciton Channel of Photoactivation for Redox Reactions on the Surface of 2D ZnO Nanostructures
AU - Titov, Victor V.
AU - Lisachenko, Andrey A.
AU - Labzovskaya, Mariana E.
AU - Akopyan, Irina Kh.
AU - Novikov, Boris V.
PY - 2019/11
Y1 - 2019/11
N2 - The resonance excitation of excitons was used for the first time to activate photocatalytic redox reactions on ZnO. The sample activity was tested using the photoactivated oxygen isotope exchange (POIE), which can be used to predict both oxidation and reduction reactions. When the excitation energy is transferred to the surface by an electrically neutral exciton, then the main losses in transferring the photogenerated e–/h+ pairs due to recombination and to overcoming the surface potential barrier are strongly reduced. The radiative decay of an exciton on the ZnO surface is excluded by a 2D structure ZnO/ZnO1–x/O–, in which the exciton decays nonradiatively into a pair of long-lived (up to 8 × 103 s) electron and hole local states, on which in its turn a chemical reaction can take place. These centers decay at 450 K, emitting green luminescence. The exciton resonance excitation allows one to obtain the order-of-magnitude higher values of the efficiency of redox reaction compared to the case of interband excitation.
AB - The resonance excitation of excitons was used for the first time to activate photocatalytic redox reactions on ZnO. The sample activity was tested using the photoactivated oxygen isotope exchange (POIE), which can be used to predict both oxidation and reduction reactions. When the excitation energy is transferred to the surface by an electrically neutral exciton, then the main losses in transferring the photogenerated e–/h+ pairs due to recombination and to overcoming the surface potential barrier are strongly reduced. The radiative decay of an exciton on the ZnO surface is excluded by a 2D structure ZnO/ZnO1–x/O–, in which the exciton decays nonradiatively into a pair of long-lived (up to 8 × 103 s) electron and hole local states, on which in its turn a chemical reaction can take place. These centers decay at 450 K, emitting green luminescence. The exciton resonance excitation allows one to obtain the order-of-magnitude higher values of the efficiency of redox reaction compared to the case of interband excitation.
UR - https://pubs.acs.org/doi/10.1021/acs.jpcc.9b08507
M3 - Article
VL - 123
SP - 27399
EP - 27405
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
SN - 0022-3654
IS - 45
ER -
ID: 49437415